Imagine apartments built into what used to be department stores, (Oh, you’re JC Penny 203? I’m at Sears 106). Get those old arcades up and running. Set up meal stations at the food court. Once people actually live there, stores will start to move back in.
If I’m unable to finish my life in my own home, that doesn’t sound like a terrible option.
Might also depend on the timing. At least in the 90s, my area was as described, a hangout place where ambient hanging out was considered just fine because enough people bought stuff it was worth it and people behaved relatively well, or they had enough security to make that the case.
Now there’s all sorts of signs up about unaccompanied teenagers are not allowed.